Variables | Cohort | |
---|---|---|
Training | Validation | |
N = 2796411 | N = 1198461 | |
Mothers’ Age (%) | ||
≤ 24 Years | 794486 (28.41) | 341018 (28.45) |
25-29 Years | 803113 (28.72) | 344361 (28.73) |
30-34 Years | 758087 (27.11) | 325266 (27.14) |
≥ 35 Years | 440725 (15.76) | 187816 (15.67) |
Mothers’ Nativity (%) | ||
Born in U.S. | 2172903 (77.70) | 931206 (77.70) |
Born Outside U.S. /Unknown/Not Stated | 623508 (22.30) | 267255 (22.30) |
Mothers’ Race (%) | ||
White | 2119115 (75.78) | 907536 (75.73) |
Black | 447972 (16.02) | 192503 (16.06) |
American Indian/Alaskan Native/Asian or Pacific Islander | 229324 (8.20) | 98422 (8.21) |
Mothers’ Hispanic Origin (%) | ||
Non-Hispanic/Hispanic Origin Not Stated | 2151766 (76.95) | 921667 (76.90) |
Hispanic | 644645 (23.05) | 276794 (23.10) |
Marital Status (%) | ||
Married | 1672583 (59.81) | 716631 (59.80) |
Unmarried | 1123828 (40.19) | 481830 (40.20) |
Mothers’ Education (%) | ||
≤ High School or GED/Unknown | 1102757 (39.43) | 472551 (39.43) |
Associate/Some College Credit | 786618 (28.13) | 336873 (28.11) |
≥ Bachelor's | 806822 (28.85) | 346400 (28.90) |
Missing | 100214 (3.58) | 42637 (3.56) |
Pre-pregnancy Smoking Status (%) | ||
Nonsmoker | 2357285 (84.30) | 1009935 (84.27) |
Smoker/Unknown/Not Stated | 338912 (12.12) | 145889 (12.17) |
Missing | 100214 (3.58) | 42637 (3.56) |
Pre-pregnancy BMI (%) | ||
Under Weight-Normal ≤ 24.9 | 1288811 (46.09) | 552926 (46.14) |
Overweight 25.0-29.9 | 664673 (23.77) | 283995 (23.70) |
Obesity ≥ 30.0/Unknown/Not Stated | 742713 (26.56) | 318903 (26.61) |
Missing | 100214 (3.58) | 42637 (3.56) |
Pre-pregnancy Diabetes Status (%) | ||
No/Unknown/Not Stated | 2675048 (95.66) | 1146820 (95.69) |
Yes | 21149 (0.76) | 9004 (0.75) |
Missing | 100214 (3.58) | 42637 (3.56) |
Pre-pregnancy Hypertension Status (%) | ||
No/Unknown/Not Stated | 2653410 (94.89) | 1137811 (94.94) |
Yes | 42787 (1.53) | 18013 (1.50) |
Missing | 100214 (3.58) | 42637 (3.56) |
Previous Preterm Birth Status (%) | ||
No/Unknown/Not Stated | 2621496 (93.75) | 1123851 (93.77) |
Yes | 74701 (2.67) | 31973 (2.67) |
Missing | 100214 (3.58) | 42637 (3.56) |
Infertility Treatment Usage Status (%) | ||
No/Unknown/Not Stated | 2654757 (94.93) | 1137952 (94.95) |
Yes | 41440 (1.48) | 17872 (1.49) |
Missing | 100214 (3.58) | 42637 (3.56) |
Fertility Enhancing Drug Usage Status (%) | ||
No/Not Applicable/Unknown/Not Stated | 2676910 (95.73) | 1147528 (95.75) |
Yes | 19287 (0.69) | 8296 (0.69) |
Missing | 100214 (3.58) | 42637 (3.56) |
Delivery Payment Source (%) | ||
Medicaid | 1164617 (41.65) | 499282 (41.66) |
Private Insurance | 1276362 (45.64) | 547205 (45.66) |
Self-pay/Other/Unknown | 255218 (9.13) | 109337 (9.12) |
Missing | 100214 (3.58) | 42637 (3.56) |
Newborn Gestational Age (%) | ||
< 34 weeks: ePTB | 93751 (3.35) | 40258 (3.36) |
≥ 34 weeks | 2702660 (96.65) | 1158203 (96.64) |